Grinding machine



1,633,558 June 1927' R. 1.. MORGAN GRINDING MACHINE Original Filed Nov.20. 1920 6 Sheets-Sheet I 11,633,558 June 21 1927' R. L. MORGAN GRINDINGMACHINE OriginalFiled Nov.20. 1920 s Sheets-Sheet 2 Warm June 21 ,1927:1,633,558

R. L. MORGAN GRINDING MACHINE Original Filed Nov. 20, 1920 eSheets-Sheet 3 J 2 Vera 2507" Jfa4vfi Z fizyaiz June 21,1927.

R. L. MORGAN GRINDING MACHINE Original Filed NOV. 20. 1920 6Sheets-Sheet 4 I E w 6 Nb Nb :1 2 1927. G R. MORGAN GRINDING MACHINEOriginal Filed Nov. 20, 1920 6 Sheets-Sheet 5 J 21 1927' R. L. MORGANGRINDING MACHINE Original Filed Nov.20. 1920 s Sheets-Sheet 6 IR mm mmR. m illlllllrllp w mmn l l J M Patented June 21, 1927.

RALPH L. MORGAN, OF WORCESTER, MASSACHUSETTS, ASSIGN OR TO GREENFIELDTAP AND DIE CORPORATION, OF GREENFIELD, MASSACHUSETTS, A CORPORATION OFMASSACHUSETTS.

GRINDING MACHINE.

Original application filed November 20, 1920, Serial No. 425,475.Divided and this application filed March 12, 1923. Serial No. 624,358.

This application is a division of my prlor application Serial No.425,?75, filed Nov. 20, 1920 and relates to a grind ng machine operatedby fluid pressure, applied and controlled by certain novelconstructlons, arrangements and combinations of parts which arehereinafter described and more specifically pointed out in the appendedclaims.

It is the object of my present invention to provide a grinding machinehaving an improved fluid operated driving mechanism, together withimproved controlling devices therefor by which relative feed of the workand the grinding wheel may be conveniently secured and by which theflexibility of control of the feed may be greatly increased.

A further object of my invention is to provide in a grinding machinecertain improved mechanism and controlhng devices therefor by which arelatively rapid feed may be quickly and easily obtained when desired,such rapid feed being designed for use during relative movement of theparts toward and from operative relation.

In the present embodiment of my invention, I have shown my improvementsadaptnal grinding machine. Auxiliary mechanism is also shown by whichthe, cross feed of the grinding wheel may also be actuated andcontrolled.

A grinding machine embodying my invention is shown in the accompanyingdrawings, in which Fig. 1 is a front elevation of the machine;

Fig. 2 is an end elevation;

Fig. 2 is a detail of the grinding wheel belt tightener;

Fig. 3 is a sectional elevation on an enlarged scale of Fig'. 1;

Fig. 4 is a cross-section on line 44 of Fig. 3;

Fig. 5 is a side elevation on an enlarged scale of the throttle valveand operating handle;

Fig, 5 is a detail front elevation of the lower end of the operatinghandle;

Fig. (i is a sectional elevation on an en larged scale of the mainvalve;

Fig. 7 is a cross-section on the line 77 of Fig. 6;

Fig. 8 is a cross-section on the line 88 of Fig. 6 on a still furtherenlarged scale;

Fig. 9 is a front elevation of the parts shown in Fig. 8;

Fig. 10 is a front elevation partly in section of the automatic crossfeeding mechanism for the grinding wheel;

Fig. 11 is a cross-section on the line 1111 of Fig. 10 on an enlargedscale; and

Figs. 12, 13 and 14 are diagrams illustrating the operation of the valvemechanisms which control the operation of the work table.

The invention will be best understood by a detailed description of theparts and connections.

Referring to the drawings and in detail, A designates the frame on base,This base has a lengthwise extending V and a flat Way and a work table Bis fitted to slide back and forth thereon. Bolted to this work table isa bearing block C, in which is journalled a shaft D on the end of whichis screwed the chuck E which holds the piece of work or blank which isto be ground. A pulley F is secured on the shaft D and the block is madehollow so that ed to reciprocate the work table of an interthe shaft canbe driven from below and the pulley covered up so as to be out of thewayof the operator.

A driving shaft 10 is journalled in bearings or brackets secured to therear of the base A and the same is driven by a pulley 11 secured on thesame to which a belt may be led from a suitable counter'shaft. A pulley12 is also secured on the shaft 10 and is employed to drive the oil pumphereinafter referred to. A cradle G is carried by the shaft 10 andextends inside of the base A. This cradle consists oftwo arms 13 pivotedon the shaft 10, said arms being connected together by a tying member14. A drum 15 is mounted on a shaft 16 which is journalled in bearings1717 formed or carried on the arms 13-13 as illustrated in Fig. 4. Abelt 18 is led around said drum 15 and around the pulley F. The pulley Fis flanged as shown in Fig. 8 so that as the work table is reciprocatedback and forth on the base, the chuck E will be rotated, the belt movingalong the drum 15. The weight of the cradle and the parts which arecarried thereby is relied upon to kee the belt 18 under tension. A wirerope 19 is connected to the cradle and is led up over a small pulley orwheel secured inside of the frame and the end of the rope is attached toa-lever 20 pivoted to the back of the frame and extending out through aninverted L-shaped slot in the front of the frame, A foot piece ortreadle 22 is attached to the front end of the lever. By pressing downon the treadle and moving the same to the left as shown in Fig. l, thefront end of the cradle will be raised and locked in raised position sothat tension will be taken off of the belt 18 whereby the rotation ofthe work holding chuck E will be stopped.

An arch shaped support H is secured to the base A as illustrated in Fig.2. This sup ort is made in this shape so that the wor table B can passunder the same. This support H is provided with a transversely extendingdove-tail, fitted to slide on which is a bearing block I secured inwhich is a bearing quill, journalled in which, preferably by ballbearings, is a shaft J which carries a grinding wheel K on one end and adriving pulley L on the other end. An arm 23 is pivoted to a slide 230fitted on ways formed on a bearing block I as illustrated in Fig. 2.This slide is normally forced to the rear by a spring 231 housed in thesame and fitted on a threaded shaft 232, one end of which is threadedinto the bearing block. A nut 233 is screwed on the shaft 232 to limitthe rearward movement of the slide 230 in case the grinding wheeldriving belt should break. A shaft 24 is journalled in the arm 23 andcarries on one end a pulley 25 which is driven by a belt 26 extendingfrom a suitable countershaft. Secured on the other end of the shaft 24is a pulley 250, and the grinding wheel driving belt 251 is led aroundthe same and around idler pulley 234 journalled on a stud secured in theslide 230, and around driving pulley L. A weight 28 is hung on thepivoted arm 23. By these connections the grinding wheel K will berotated at high speed and the same can be moved transversely of themachine without effecting this rotation.

A cylinder M is secured inside of the base A near the top thereof.Fitting in the same is a piston N, secured to which is a piston rod Nwhich extends out through a stuffing box attached at the left of thecylinder M as shown in Fig. 3. The piston rod N is connected at its lefthand end to a block 0 secured to the left end of the work table B. Thisconnection is preferably made yielding by placing collars 2929 on thepiston rod which is reduced or turned down at its left, hand end. Nuts3030 are threaded in the end of the piston rod and springs 31 31 areplaced between said collars and the block 0. By these connections as thepiston N is forced to the right or left in the cylind r (Fig. 3) thework table will be correspondingly moved back and forth in the ways. Avalve casing P is secured to the front of the frame or base A andworking in this valve casing is a main valve and two auxiliary valves,these valves being employed to controlpthe flow of liquid to and fromthe ends of the'cylinder M and thereby to control the movements orreciprocation of the work table.

The liquid preferably a light oil which is employed to move the pistonand thus to reciprocate the work table, is kept in a tank S and is takentherefrom by a gear pump T and forced through a pipe 32 to a casing Uwhich contains a throttle valve V operated by an operating handle W'.The liquid passes from the valve casing U to the main valve through apipe 33.

The throttle valve construction is illustrated in detail in Fig. 5. Thethrottle valve V is preferably made conical in shape and is arranged toeo-operatc with a tapered valve seat formed in a partition in the easingU. The valve V is formed or mounted on a stem 34 which is carried outthrough a stuifing box A block 36 having trun- .nions or studs 37 issecured on the valve stem 34 by a taper pin and a spring 38 is arrangedbetween said block 36 and the stuffing box 35 so as normally to forcethe throttle valve V to its seat to close the same. The end of the valvestem 34 is fitted in a hole in an adjusting knob 39 threaded into abracket extending outwardly forming part of the throttle valve casing U,a check nut 40 being threaded on the ad justing nut. The lower end ofthe operating handle is made in the form of a yoke and each prongthereof is slotted so as to engage the studs 37. Normally the valve stem34 is forced outwardly to the bottom or end of the hole in the adjustingnut 39. By turning the adjusting nut and by unlocking and locking thecheck nut 40, the amount of normal opening of the throttle valve can beadjusted so that the speed of the normal movement or reciprocation ofthe work table B can be determined. The normal position of these partsis illustrated in Fig. 4. By pulling the top of the operating handleoutwardly from the front of the machine as illustrated by the arrow inFig. 5, the throttle valve can be opened as wide as desired and by thismanual manipulation the speed of the work table can be increased to anydesired degree within the limits of the design of the machine. Thisbrings in an important point of control as will be referred to moreparticularly after the valves have been described.

'- the right hand en of the main valve casing and a. stuffing box 46 isarranged therein through which the 1'od44 passes. Therod. 44 is alsofitted in a bearing 47 formed on the throttle valve casing U. A plug 48is screwed into the other endof the main valve casing.

Each auxiliary valve R consistsof a.pis ton 49 and a piston 50 formed ona stem 51 extending out through a stuffing box 52 screwed in the valvecasing. The auxiliary valves are oppositely arranged. The innermostpistons 50 are. turned down or have beveled ends as shown so that ifthey butt together there will still be room for some oil to get betweenthem as illustrated in Fig. 13. The valve casing P is bored or formedwith passages which are arranged as follows. The ipe 33 connects to apassage which is divided into two branches 53 and 54 controlled byistons 41 and 43 of the main valve. An ex aust passage 55 is controlledby the piston 42 of the main valve and this passage is connected by apipe 56 to the oil tank S. A passage is connected by i e 57 to the lefthand end of the cylinder llfand a passage is connected by pi e 58 to theright hand end of the cylinder lid the cylinder being provided at itsends withheads to which these pipes connect. The pipe or passage 33 alsoconnects by a passage 59 to the part of the casing in which theauxiliary valves operate. This passage has branches 60 and 61. The partof the valve casing which contains the auxiliary valves is connected tothe left of the main valve by a passage 62 and to the right of the mainvalve by a passage 63. This part of the casing is also connected to theexhaust pipe 56 by a passage 64which is branched as at 65, the ends ofthe passages 64 and 65 also being branched out into twoepassages, onetoco-operate with the side and the other with the end of each piston 49of the auxiliary valves. The ends of the main valve casing are connectedby pipes 66 and 67 to operate the traverse feed of the grinding wheel ashereinafter described.

The way the liquid flows through these various passages will behereinafter detailed after the various other parts have been described.

The intermediate section of the operating handle W is formed into arectangular loop or strap 68. A sleeve 69 is slidable on the cylindricalhead 45 of the main valve. which sleeve has an extending arm 70 whichhas at its end a block71 through which the stem 44 of the main valvepasses. The block 71 is fitted inside the strap 68 and these parts aresecured together by a pivot bolt 72 (see Fig. 5). Theparts 69, 70 and 71are preferably made one integral piece and the arm 70 is shaped to clearthe stufling box 46 as shown in Fig. 6. An arm 73 is also preferablyformed with the parts 69, 70 and 71 and a stud 74 is held therein by asuitable nut (see F igs'. 8 and 9). A rocker wing 75 is secured on thestem of the right hand auxiliary valve R- and the samehas a. slot 76into which the stud 74 fits.

W can be moved to the right or left around the studs 37 as a pivot andthis movement will push the main valve Q to the right or left. Also thetop of the operatin handle can be pulled outwardly or away om the frameof the machine, in this operation the stem or rod 44 of the main valveacting as a pivot. This operation will correspondingly open the throttlevalve. This operation can take place no matter how the bandle standslongitudinally of the machine. WVhen the handle W is pulled outwardlythe rocker wing 75 is artly rotated as indicated in dotted lines in ig.8 for a purpose hereinafter described. a

The work table B is provided along its front face with a T slot 77. Adog 78 is fitted into this slot and is provided with a latch 79 hung ona screw 80- by whichthe dog is clamped in adjusted position. The

top of the latch 79 is shaped to engage a projection 81 on the dog 78and the latch is kept to the right (Fig. 6) by a plunger 82 and a spring83. The latch thus forms a pawl, the lower end of which can be moved tothe left as shown in Fig. 3 against a spring tension. Another or lefthand dog 84 is secured in the slot 77 by a locking bolt 85. An engagingscrew 86- is preferably threaded into this dog in position to engage thestem 51 of the left hand auxiliary valve R. The right hand dog is placedin position to engage the wing 75 secured on the stem 51 of the righthand auxiliary valve, when the same is in normal position. But when thewing is swung out of operative position by the movement indicated bydotted lines in Fig. 8, the latch 79 will clear the same.

The mechanism for operating the traverse feed of the grinding wheel willnow be described and reference to follow this operation should be had toFigs. 10 and 11. The pipes 66 and 67 extending from the main valvecasing are connected to a cylinder 87 secured to the front of the frameat the right hand end. A plug 88 with an upwardly extending projection880 is screwed in the bottom of the cylinder 87.. A lower or floatingpiston 89 provided with an upwardly extending hub 90 is fitted in thecylinder 87. This piston 89 is shown in its lowest position and it willbe seen that liquid coming in through the pipe 67 always can act on thebottom of the piston by reason of the projection 880 on the plug 88. Anupper piston 91 is also'fitted in the cylinder 87 and has a piston rod92 extending out through a stuffing box 93 secured in the top of thecylinder 87. The upper pi ston 91 will always be subjected to fluidcoming in through the pipe 66 by reason of the hub or upwardly extendingprojection 90 on the lower or floating piston 89. A spring 94 isarranged around the piston rod and acts to force the upper piston 91normally to its lowest position. bracket 95 is secured to the frame orcasing A and a limiting screw 96 is threaded therein, this screw beingset in position so that the upper end ,of-the piston rod 92 will engagethe same.

This screw 96 is provided with a knurled head and by turning thesamepthc upward movement of the piston rod 92 can be adjusted. Thescrew' 96 is provided with a nut 97 so that it can be locked in adjustedposition.

When

fluid under pressure icoines in I through the pifpe 67, the lower orfloating e orced upwardly to strike'the piston will b upper piston,which then will be forced upwardly until the piston rod 92 engages theend of the adjusting screw 96.

" If fluid under pressure comes in through and by the use of this sim 1emechanism the cross or traverse feed 0 the grinding wheel can be set tooperate at either or both the reversing movements of the work table andthe feed movements can be adjusted.

The piston rod 92 is connected to one arm 98 of a three armed lever 98,99 and 100. The arm 99 of this lever is provided so that the feed can beworked by hand. A pawl 101 is pivoted to the arm 100 of this lever andthis pawl engages with a ratchetwheel 102 secured on a quill 103'. Ahand wheel 104 is also secured on the quill. The quill is journalled ona stud 105 secured in the frame. A pinion 106 is cut on the quill. Thethree armed-lever 98, 99 and 100 turns loosely on the quill and on thehub of the ratchet wheel 102. The pinion 106 engages a gear 107 fastenedon the end of a feed screw 108 turning in a bearing 109 secured' in theframe A. The feed screw 108 is threaded into anut 110 secured to thebearing blockI. An indicator 111 may be secured to the bracket 95 toregister with marks on the ratchet wheel 102 for indicating the amountof feed. The pipes 66 and 67 iille provided with valves 112 and 113 sothat the feed can take place at either or both reverses ofithe tablemovement.

The operation will now be described. Normally the two auxiliary valvesare .forced outwardly in the casing. This nor mally will connect the'twoends of the main f valve to the exhaust. The main valve there-- fore canbe moved to any position by the operating handle W. c When the mainvalveand operating handle are moved to the left as shown in Fig. 12, fluidunder pressure is let into the left hand end of the cylinder M and thetable is moved to the right, the right hand end of the cylinder beingconnected to; the exhaust. When the operating handle W is moved to theright as indicated in Fig. 13, the right hand end of the cylinder M isconnected to the pressure and the left hand end to the exhaust and thetable is moved to the left. When the handle is set in the verticalposition of Fig. 14 the middle piston 42 of the main valve covers theexhaust passage 55 and thepistons 41 and 42 close the inlet passages 53and 54 and the movement of the piston N and table B is stopped. Thus,the movements of the table are always within the control of the handle.The speed of the normal movements of the table 'is regulated by theadjustment of the throttle valve as hereinbefore described. If thehandle is pulled outwardly, the throttle valve is opened and themovement takes place at a faster speed.

When apiece of work is to be ground, the same is clamped in the chuck Eand the chuck is set in rotation. The' rinding wheel is also set inrotation and 11e same is adjusted to proper transverse position forinitial engagement with the inside of the work. The dogs are adjusted inposition on the work table so that the table will have the rightmovement-.of reciprocation so that the wheel will grind the requireddistance on the work. The traverse feed of the hand dog engages the.stem of the left hand auxiliary valve B. This engagement will move theleft hand auxiliary valve inwardly and will let the pressure act ontheleft hand of themain valve. This will shift the main valve to the rightas indicated in Fig. 13 and will reverse the movement of the table andstart the same on its movement to the left. As the table starts on itsleft hand movement, the left hand auxiliary valve will move to the leftback to its normal position. \Vhen the table reaches the end of itsdesired movementto the left, the latch 79 of the right hand dog willengage the wing 75 on the stem of the right hand auxiliary valve andwill push the same inwardly which will let pressure on the right handend of the pilot valve causing the same to shift from the position shownin Fig. 13

back to the position shown in Fig. 12 whereby the movement of thetableto the left will be reversed and the same will be started on itsmovement to the right. Thus, the table will reciprocate backward andforward. As the table reverses at the right hand end of its movement,pressure will be allowed to flow into the pipe 67 and as the tablereverses at the left, pressure will be allowed to flow through pipe 66.The pipes 66 and 67 are normally connected to exhaust. Thus the traversefeed of the grinding wheel can take place at either or both reversingmovements of the table depending how the valves 112 and 118 are opened.

When it is desired to get a quick movement of the table to its extremeleft hand position, as for example for examination or calipering of thework or after the piece under operation is ground, the operating handleis pulled way out and is thrown to the right. As the operating handle ispulled way out, by the connections previously described the rocker wing75 will be moved so that as the table moves rapidly on its movement tothe left, the latch 79 will not engage the same. Thus, the table willmove quickly to its extreme left hand position. This permits theoperator to remove the piece in the chuck that has been ground and toinsert a fresh piece. After this is done, the operating handle W can bethrown to the left and the table, started on its movement to the right.This can take place at the normal speed as previously described, or ifdesired, this movement can take place at a high speed until the workengages the grinding wheel by pulling outwardly on the handle W when itis thrown over to the left.

Having thus described my invention and the operation and advantagesthereof, it will be evident that changes and modifications can be madetherein by those skilled in the art, within the scope of my invention asset forth in the claims and I do not wish to be otherwise limited to thedetails herein disclosed, but what I claim is:

1. A grinding machine having, in combination, a grinding wheel, a frame,a member fitted to slide thereon to produce relative axial movement ofthe wheel and work, a cylinder and piston for reciprocating said member,and controlling mechanism therefor normally effective to maintaln agiven adjusted uniform rate of travel of said sliding member, saidcontrolling mechanism including a main valve for said cylinder, 3. speedadjusting device, and a valve WlllCh may be actuated to give said membera higher speed when the wheel and work are in spaced relation, whileleaving the normal speed adjustment unchanged.

2. A grinding machine having, in combination, a grinding wheel, a frame,a member fitted to slide thereon to produce relative axial movement ofthe wheel and work, a cylinder and piston for reciprocating said member,controlling mechanism therefor normally effective to maintain a givenuniform rate of travel of said sliding member, said controllingmechanism including a main valve for said cylinder and an additionalvalve which may be actuated to give said member a higher speed toseparate the grinding wheel and work or to move them toward each other,and a single manual means controlling said main valve and also saidadditional valve.

3. A grinding machine having, in combination, a grinding wheel, a frame,a member slidable thereon to produce relative axial movement of thewheel and work, a cylinder and piston to reciprocate said member, and ayielding cushioning connection between said piston and said member.

4. A grinding machine having, in combination, a grinding wheel, a frame,a member fitted to slide thereon to produce relative axial movement ofthe wheel and work, a cylinder and piston for reciprocating said member.a main valve mechanism controlling said cylinder and piston, means tocontrol the speed of said sliding member, said means including anadjusting device determining the normal speed thereof and a valvemovable to give said member a temporary higher speed while leaving thenormal speed adjustment of said member unchanged, an auxiliary mechanismcontrolling said main valve mechanism, and actuating devices for saidauxiliary mechanism, whereby the direction of travel may be reversed.

5. A grinding machine having, in combination, a grinding wheel, a frame,a member fitted to slide thereon to produce relative axial movement ofthe wheel and work, a cylinder and piston for reciprocating said member,and speed-control mechanism for said sliding member, said mechanismincluding valve mechanism effective to control the movement of saidsliding member at a regulated speed, means to adjust said speed, andmeans effective to cause said sliding member to move at a differentspeed while said regulated speed adjustment remains unchanged, saidregulated valve mechanism being automatically restored to a position ofcontrol when said latter means is released.

6. A grinding machine having, in combination, a grinding wheel, a frame,a member fitted to slide thereon to produce relative axial movement ofthe wheel and work, a cylinder andpiston for reciprocating said member,and speed-control mechanism for said sliding member, said mechanismincluding valve mechanism effective to control the movement of saidsliding member at a regulated speed, means to adjust said speed, meanseffective to cause said sliding member to move at a different speedwhile said regulated speed adjustment remains unchanged,

and mechanical means to restore said regulated speed when said lattermeans is released.

7. A grinding machine having, in combination, a grinding wheel, a frame,a member fitted to slide thereon to produce relative axial movement ofthe wheel and work, a cylinder and piston for reci rocating said member,valve mechanism e ective to control the movement of said sliding memberat a regulated speed in both directions, means to adjust said regulatedspeed, and means to increase the speed of movement of said slidingmember in both directions while leaving said regulated speed adjustment1111- changed, said regulated valve mechanism being automaticallyrestored to a position of control when said latter means is released.

8. A grinding machine having, in combination, a wheel, a frame, a membermounted to slide on said frame to produce relative movement of the wheeland work, a cylinder and piston for reciprocating-said member, a valvemechanism controlling the movement of said member at -a selected speed,automatic reversing devices for said valve mechanism, additionalmechanism controlling the movement of said member at a different speed,and means to disable said automatic reversing devices and to render saidlatter mechanism operative, said valve mechanism being automaticallyrestored to a condition of control when said additional mechanismbecomes inoperative. a,

9. A grinding machine having, in combination, a wheel, a frame, a membermounted to slide on said frame to produce relative axial movement of thewheel and work, a cylinder and piston for reciprocating said member, avalve mechanism controlling the movement of said member at a selectedspeed, automatic reversing devices for said valve mechanism, and meansadditional and separate from said valve mechanism and said reversingdevices, effective to cause relative movement of the work and wheel at adifferent speed, said valve mechanism being automatically restored to acondition of control when said additional means becomes inoperative.

10. A grinding machine lnving, in combination, a wheel, a frame, amember mounted to slide on said frame to produce rela tive axialmovement of the wheel and work, said member having an operative range ofmovement with the work 1n grinding position relativel to the wheel "andhaving an idle position lieyond said operative range,a cylinder andpiston for reciprocating said member, a valve mechanism controlling themovement of said member when in said operative range and fixing the rateof movement within said range at a predetermined selected speed,reversing devices for said valve mechanism, and means additional andseparate from said valve mechanism and said reversing devices effectiveto cause relative movement of the work and wheel toward and thereafteraway from idle position when said member is out of said operative rangeand at a higher rate of travel.

11. A grinding machine having, in combination, a wheel, a frame, amember mounted to slide on said frame'to produce relative axial movementof the wheel and work, means to reciprocate said member at a se lectedspeed, automatic reversing devices for said reciprocating means, andmeans to render one of said reversing devices inoperative and tothereafter move-said member axially at an increased speed.

12. A grinding machine having, in combination, a frame, a member mountedto slide on said frame to produce relative axial movement of the wheeland work, means to reciprocate said member at a selected speed,automatic reversing devices for said reciprocating means, and a singlemanually operated reversing device effective to independently determinethe direction of travel of said member and also to increase the rate oftravel of said member.

13. A grinding machine having, in combination, a wheel, a frame, a tableslidable on said frame, a cylinder and piston effective to move saidtable longitudinally relatively to the axis of said wheel, across feedeffective to move said wheel transversely to said table, a "cylinder andpiston connected to actuate said cross feed, and controlling connectionsfrom said first cylinder to said second cylinder whereby said cross feedwill be actuated upon reversal of movement of said table at one end ofthe table travel.

14. A grinding machine having, in combination, a wheel, a frame, atableslidable on said frame, a cylinder and piston effective to move saidtable longitudinally relatively to the axis of said wheel, a cross feedeffective to move said wheel transversely to said table, a cylinder andpiston connected to actuate said cross feed, controlling connectionsfrom said first cylinder to sald second cylinder whereby said cross feedwill be actuated upon reversal of table movement, and manually operablevalves in said connections efi'ective to selectively render said crossfeed operative at either or both ends of the table travel.

15. A grinding machine having, in combination, a Wheel, a frame, amember slidable thereon to produce relative axial movement of the wheeland work, fluid operated actuating devices for said member, valvemechanism for said device, automatic con trolling and reversing devicesfor said valve mechanism. and a single lever ell'ective to disable saidautomatic controlling and reversing devices and to manuallycontrol thedirection and rate of movement of said member, said automaticcontrolling and reversing devices automatically resuming control of thetravel of said member whenever said single lever is released and becomesinoperative.

16. A grinding machine having, in combination, a wheel, a frame, amember slidable thereon, a cylinder and piston connected to reciprocatesaid member to produce relative longitudinal movement of the work andwheel, a main valve mechanism for said cylinder and piston, and anauxiliary valve mechanism for controlling said main valvemechanism, saidauxiliary valve mechanism being automatically controlled by engagementwith portions of said moving member.

17. A grinding machine having, in combination, a wheel, a frame, amember slidable thereon to produce relative axial movement of the wheeland work, a cylinder, and piston connected to reciprocate said member, amain valve mechanism for said cylinder and piston, an auxiliarymechanism for controlling said main valve mechanism, said auxiliarymechanism being automatically controlled by engagement with portions ofsaid moving member, and an additional manually operable handle effectiveto independently control said main valve mechanism.

18. A grinding machine having, in combination, a wheel, a frame, amember slidable thereon, a cylinder and piston connected to reciprocatesaid member to produce relative longitudinal movement of the work andwheel, a main valve mechanism for said cylinder and piston, an auxiliarymechanism for controlling said main valve mechanism, said auxiliarymechanism being automatically controlled by engagement with portions ofsaid moving member, and an additional manually operable handle effectiveto independently control. said main valve mechanism, said auxiliaryvalve mechanism normally connecting said main valve mechanism to theexhaust so that it may be freely movable by said handle.

19. A grinding machine having, in combination, a wheel, a frame, amember slidable thereon, a cylinder andpiston connected to reciprocatesaid member to produce relative longitudinal movement of the work andwheel, a main valve mechanism for said cylinder and piston, an auxiliarymechanism for controlling said main valve mechanism, said auxiliarymechanism being automatically controlled by engagement with portions ofsaid member, a throttle valve to control the flow of fluid to said mainvalve mechanism-and a singleimanually operable handle connected.t0..control both the main valve mechanism f-and said throttle valve.

20. An internal grinding machine having, in combination, a'wheel, aframe, a member mounted tdslide on said frame to produce relative axialmovement of the Wheel and work, a cylinder and piston for reciprocatingsaid member, a valve mechanism for said cylinder and piston, stops onsaid member adjustable longitudinally thereof, control means-engaged bysaid stops to control said valve mechanism, thereby normally limitingthe travel of said member in both directions, and additional meanseffective to produce relative movement of said control means and One ofsaid stops to prevent operative engagcment thereof while maintaining theadjusted position of said stop.

21. An internal grinding machine having, in combination, a wheel, aframe, a member mounted to slide on said frame to produce relative axialmovement of the wheel and work, a cylinder and piston for reciprocatingsaid member, a valve mechanism for said cylinder and piston, stops onsaid member adjustable longitudinally thereof, control means engaged bysaid stops to control said valve mechanism, thereby normally limitingthe travel of said member in both directions, and additional manualmeans effective to produce relative movement of said control means'andone of said stops to prevent operative engagement thereof, whilemaintaining the adjusted position of said stop. thereby permitting saidparts to pass without reversing the travel of said member, one of saidparts yielding upon the return movement of said member to restore normaloperative relations of said device and stops.

'22. An internal grinding machine having, in combination, a wheel, aframe, a member mounted to slide on said frame to produce relative axialmovement of the wheel and work, a cylinder and piston for reciprocatingsaid member, a piston valve having a plurality of pistons thereoneticctive to control the passage of pressure fluid toward and from saidpiston and cylinder, and a manually operable device eifectivc to movesaid piston valve to a neutral position and stop said member at anypoint in the stroke of said piston, said piston valve having the opposedpressures thereon equalized ll i Til

during substantially the entire travel of said member and therebypermitting free movement of said piston valve by said manually operabledevice.

23. An internal grinding machine having, in combination a wheel, aframe, a. member mounted to slide on said frame to produce relativeaxial movement of the wheel and work, a cylinder and piston forreciprocating said member, a valve mechanism for said cylinder andpiston, auxiliary mechanism controlling said valve mechanism, a crossfeed mechanism for etfecting relative transverse movement of the workand Wheel, said mechanism including a cylinder and piston, and aconnection from said first named cylinder to said cross feed cylinder,said connection being opened by said auxiliary mechanism to periodicallyadmit pressure to said latter cylinder to actuate said cross feed.

2-1:. In a grinding machine, the combination of a frame, a moving memberfitted to slide thereon, a cylinder and piston for reciprocating saidmember, a main valve for controlling the flow of actuating fluid underpressure to said cylinder. a feeding device, a second cylinder andpiston connected to actuate said feeding device, and connections fortransferring fluid under pressure between said main valve and saidsecond cylinder, said fluid being effective to cause movement of saidsecond piston to actuate said feeding device upon movement of said mainvalve to one of its two operative positions.

25. In a grinding machine, the combination of a frame, a moving memberfitted to slide thereon, a cylinder and piston for reciplocating themember, a main valve for controlling the flow to the cylinder, auxiliaryvalve mechanism connected to control the movements of the main valve,dogs on the moving member for operating the auxiliary valve mechanism,afeeding device, a second cylinder having a piston therein connected tooperate said feeding device, and connections for transferring fluidunder pressure between the valvemechanism for the first cylinder andsaid second cylinder, said fluid being effective to actuate said secondpiston and operate said feeding device when the valve mechanism for thefirst cylinder is actuated.

26. In a grinding machine,-t-he combination of a frame, a. moving memberfitted to slide thereon, a cylinders'a-ndpiston for reciprocating themember, a main' valve for controlling the flow to the cylinder, twoauxiliary valves connected to control the movements of the main valve,dogs on the moving member for operating the auxiliary valves, a feedingdevice, a second cylinder having an actuating piston therein connectedto move said feeding device, a fioating piston therein adapted to engagesaid actuating piston, and connections between said main valveand saidsecond cylinder effective to admit actuating fluid under pressure behindone or' both of said pistons in said second cylinder when pressure isadmitted to move said main valve to either of its operative positions,thereby actuating said feeding device at both reversals of movement ofsaid moving member.

27. In a grinding machine, a fluid pres sure operated feed mechanismhaving in combination a frame, a moving member fitted to slide thereon,a cylinder and piston for reciprocating said member, automatic reversingdevices for said reciprocating means, a second moving member, a secondcylinder having a piston connected to move said second member, andconnections for fluid under pressure between said reversing devices andsaid second cylinder through which connections said I second pistonv iscaused to move intermittently in the same direction at each reversal oftravel of said first moving member, said second piston thereby causingmovement of said second moving member in predetermined relation to themovement of said first member.

In testimony whereof I have hereunto atlixed my signature.

RALPH vL. MORGAN.

